Develop Reference

How to get total number of months from a specific Date?

I am new to Android.I have a requirement, I have a field to enter the Date Of Birth of a person.On successful selection I wanna return the total number of months from the DOB to current date.For example, if I entered DOB as 19/10/2012 I wanna return 36(months).I searched for this, but didn't find anything suitable to my requirement.Here is my current code which return sucessful data,
private void showDate(int year, int month, int day) {
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(0);
cal.set(year, month, day);
Date date = cal.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
if(System.currentTimeMillis() > date.getTime()) {
edtDate.setText(sdf.format(date));
LocalDate date1 = new LocalDate(date);
LocalDate date2 = new LocalDate(new java.util.Date());
PeriodType monthDay = PeriodType.yearMonthDayTime();
Period difference = new Period(date1, date2, monthDay);
int months = difference.getMonths();
months=months + 1;
System.out.println("16102015:Nunber of Months"+months);
}else{
Toast.makeText(mActivity,getResources().getString(R.string.date_validationmsg),Toast.LENGTH_LONG).show();
}
}

Calendar startCalendar = new GregorianCalendar();
startCalendar.setTime(startDate);
Calendar endCalendar = new GregorianCalendar();
endCalendar.setTime(endDate);
int diffYear = endCalendar.get(Calendar.YEAR) - startCalendar.get(Calendar.YEAR);
int diffMonth = diffYear * 12 + endCalendar.get(Calendar.MONTH) - startCalendar.get(Calendar.MONTH);

To start with, I'd suggest using LocalDate instead of DateTime for the computations. Ideally, don't use java.util.Date at all, and take your input as LocalDate to start with (e.g. by parsing text straight to that, or wherever your data comes from.) Set the day of month to 1 in both dates, and then take the difference in months:
private static int monthsBetweenDates(LocalDate start, LocalDate end) {
start = start.withDayOfMonth(1);
end = end.withDayOfMonth(1);
return Months.monthsBetween(start, end).getMonths();
}
UPDATE 1
see this link the OP is accepted the same answer because Months.monthsBetween() method is not working proper for him
UPDATE 2
LocalDate userEnteredDate = LocalDate.parse( new SimpleDateFormat("yyyy-MM-dd").format(date));
LocaleDate currentDate = LocalDate.parse( new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
int months = monthsBetweenDates(userEnteredDate, currentDate)

Using Joda-time library here, I was able to get the desired result.
Try the below code it would give the desired the difference in months.
DateTime date1 = new DateTime().withDate(2012, 10, 19);
DateTime today = new DateTime().withDate(2015, 10, 19);
// calculate month difference
int diffMonths = Months.monthsBetween(date1.withDayOfMonth(1), today.withDayOfMonth(1)).getMonths();

Using JodaTime, it's really easy:
http://www.joda.org/joda-time/apidocs/
int nMonths = new Period(startTime, endTime).getMonths();

Use this code to calculate months between two dates
public static int monthsBetweenUsingJoda(Date d1, Date d2) {
return Months.monthsBetween(new LocalDate(d1.getTime()), new LocalDate(d2.getTime())).getMonths();
}

Cant fetch current time, date showing year as 1970

public static final String inputFormat = "HH:mm";
private Date date;
private Date dateCompareOne;
private Date dateCompareTwo;
LINE 5:
private String compareStringOne = String.valueOf(SetTimeActivity.intFromTimeH)+ ":"+ String.valueOf(SetTimeActivity.intFromTimeM) ;
LINE 6:
private String compareStringTwo = String.valueOf(SetTimeActivity.intToTimeH) + ":"+ String.valueOf(SetTimeActivity.intToTimeM);
SimpleDateFormat inputParser = new SimpleDateFormat(inputFormat, Locale.US);
private void compareDates()
{
Calendar now = Calendar.getInstance();
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
date = parseDate(hour + ":" + minute);
dateCompareOne = parseDate(compareStringOne);
dateCompareTwo = parseDate(compareStringTwo);
if (!(dateCompareOne.before( date ) && dateCompareTwo.after(date))) {
....
I am trying to check if current time falls between the specified time. For that I am converting the specified time into strings first (in Line5 & Line6). Even though I get the integer values correct, the string formed always shows "0:0".
Also, the year is shown as 1970 (The date & the day shown are wrong as well).
I need to get the current time. What am I doing wrong?
private Date parseDate(String date) {
try {
return inputParser.parse(date);
} catch (java.text.ParseException e) {
return new Date(0);
}
}

The parseDate() function returns the time elapsed since the 1st of January 1970. This is known as the Unix Epoch, and it's how all time is represented in Unix computers. By running the parseDate function on a string containing just hours and minutes, you're creating a Date object which represents a time HH:mm past the first of January 1970.
Your code is using a really odd way of getting the current time. Converting a Calendar to two ints, then to a string and finally parsing back to a Date is going to be inefficient and open you up to all sorts of needless errors.
When you initialise a new Date object it is automatically assigned the time of initialisation. Therefore:
Date d = new Date();
would result in d being the moment of initialisation (that is, this year, month, day, hour, minute, second and microsecond). Then you can just use Date.after() and Date.before().
If you still want to do it via the Calendar method, then you'd be better served by:
cal = Calendar.getInstance();
Date d = cal.getTime();
It may be that you've got other issues, but it's worth doing it properly first. When you pass data by writing it as a string (especially when it's time related, with all sorts of ambiguities about what "12" actually represents) you lose all the advantages that language typing gives you.

this code help you
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE); if (c.get(Calendar.AM_PM) == Calendar.AM)
am_pm = "AM";
else if (c.get(Calendar.AM_PM) == Calendar.PM)
am_pm = "PM";
// Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a");
String formattedDate = df.format(c.getTime());
Toast.makeText(this, formattedDate, Toast.LENGTH_SHORT).show();

If you already work with Date objects why not using the Date.after(...) and Date.before(...) methods.

Joda-Time and Android system time

Currently Joda DateTime can get the current Android system time, but is it possible to get the DateTime when say the Android system date or timezone has changed?
I have tried this after the Date/Timezone has changed but it does not work:
DateTime dt = DateTime.now();
DateTime dt = new DateTime();
When I use the Calendar it works fine:
Calendar c = Calendar.getInstance();
c.getTime() //Returns the correct changed Android Date and Time

As suggested by this post, you can get the Calendar time first:
public static int elapsedDaysJoda() {
Calendar cal = Calendar.getInstance();
DateTime dt1 = new DateTime(cal);
cal.set(2011, 0, 1);
DateTime dt2 = new DateTime(cal.getTime());
Days days = Days.daysBetween(dt2, dt1);
return days.getDays();
}

Have TextView show day of week as letters not integer

I have a textview which shows the day of the week as an integer (0-7). I would prefer if it could convert that to a string, which could then be shown in a TextView. My code is below. Also, how can I make it so the TextViews update the time, date, etc. (it only shows the time the app is opened)? Thanks in advance.
MainActivity.java:
package press.linx.calendar;
import java.sql.Date;
import java.text.SimpleDateFormat;
import android.os.Bundle;
import android.app.Activity;
import android.text.format.Time;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView day = (TextView)findViewById(R.id.day);
TextView month = (TextView)findViewById(R.id.month);
TextView year = (TextView)findViewById(R.id.year);
TextView time = (TextView)findViewById(R.id.time);
Time today = new Time(Time.getCurrentTimezone());
today.setToNow();
day.setText("" + today.monthDay); // Day of the month (0-31)
month.setText("" + today.month); // Month (0-11)
year.setText("" + today.year); // Year
time.setText("" + today.format("%k:%M")); // Current time
}
}
UPDATE: I got it using this piece of code:
final Calendar calendar = Calendar.getInstance();
SimpleDateFormat formatter = new SimpleDateFormat("MMM"); // 3-letter month name & 2-char day of month
TextView datetxt = (TextView) findViewById(R.id.nameofyourtextview);
datetxt.setText(formatter.format(calendar.getTime()));

To format your Time:
Time time = new Time();
time.format("%A");
It returns name of day in week (Sunday, Friday..) - see description of format string (It's a PHP man page, but the symbols are same and it's well-aranged)
In order to make textViews updated every second you have to use Timer and TimerTask.
Define UpdateTimeTask:
class UpdateTimeTask extends TimerTask {
public void run() {
// Update time, must be called using runOnUiThread
}
}
and then set timer:
Timer timer = new Timer();
TimerTask updateTime = new UpdateTimeTask();
timer.scheduleAtFixedRate(updateTime, 0, 1000);

I assume you are looking for the date to be displayed in the below format.
You can use the below
Date now = new Date();
SimpleDateFormat dateFormatter = new SimpleDateFormat("EEEE, MMMM d, yyyy");
System.out.println("Format : " + dateFormatter.format(now));
Output
Format : Thursday, April 25, 2013
Few helpful links
http://www.ntu.edu.sg/home/ehchua/programming/java/DateTimeCalendar.html
http://www.roseindia.net/tutorial/java/core/convertDateToWords.html

To get the current day of the week (i.e. Monday, Tuesday, Wednesday, etc.) try:
DateFormat fmt = new SimpleDateFormat( "EEEE" );
fmt.format( new java.util.Date() );

Try this
month.setText(getMonth(today.month));
day.setText(getWeek(today.monthDay));
method to get month based on month number
public String getMonth(int month) {
return new DateFormatSymbols().getMonths()[month];
}
method to get week based on week number
public String getWeek(int weekno) {
return new DateFormatSymbols().getWeekdays()[weekno];
}

Do you mean display as Mon, Tue, Wed,.... ?
Use this format.
SimpleDateFormat curFormatDate = new SimpleDateFormat("EEE");

Best way to format a date relative to now on Android

I am creating a feature in an Android app to get an arbitrary date (past, present or future) and find the difference relative to now.
Both my now and due variables are longs, and this is my code:
long now = System.currentTimeMillis();
long due = now + 864000;
Log.d("Time in 1 day", DateUtils.getRelativeTimeSpanString(due,now, DateUtils.DAY_IN_MILLIS));
I want the output to be something like yesterday, today, in 4 days or 19/12/2012. However, the current output returns in 0 days...
I don't want the time to appear on these date strings.
What am I doing wrong and is the best method for formatting dates on Android?

What I have in mind is changing:
DateUtils.getRelativeTimeSpanString(due, now, 0L, DateUtils.FORMAT_ABBREV_ALL);
Since the documentation says it returns the time relative to now.
If that fails use some of the brilliant libraries:
Joda Time
PrettyTime
TimeAgo

Finally I have implemented what you wanted..!
First you need to download Joda Time from here
Extract it to any folder and put joda-time-2.2.jar into androidProject/libs folder.
MainActivity
import org.joda.time.DateTime;
import org.joda.time.Days;
import org.joda.time.Months;
import org.joda.time.MutableDateTime;
import org.joda.time.Weeks;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
public class MainActivity extends Activity
{
private int day ;
private int month ;
private int year ;
private int hour ;
private int minute ;
private long selectedTimeInMillis;
private long currentTimeInMillis;
private String strDay ="";
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
year = 2013;
month = 8;
day = 10;
hour = 15;
minute = 28;
DateTime selectedTime = new DateTime(year,month,day,hour,minute);
selectedTimeInMillis = selectedTime.getMillis();
MutableDateTime epoch = new MutableDateTime();
epoch.setDate(selectedTimeInMillis); //Set to Epoch time
DateTime now = new DateTime();
currentTimeInMillis = now.getMillis();
int days = Days.daysBetween(epoch, now).getDays();
int weeks = Weeks.weeksBetween(epoch, now).getWeeks();
int months = Months.monthsBetween(epoch, now).getMonths();
Log.v("days since epoch: ",""+days);
Log.v("weeks since epoch: ",""+weeks);
Log.v("months since epoch: ",""+months);
if(selectedTimeInMillis < currentTimeInMillis) //Past
{
long yesterdayTimeInMillis = currentTimeInMillis - 86400000;
DateTime today = new DateTime(currentTimeInMillis);
int year = today.getDayOfYear();
int intToday = today.getDayOfMonth();
DateTime yesterday = new DateTime(yesterdayTimeInMillis);
int intYesterday = yesterday.getDayOfMonth();
DateTime selectedDay = new DateTime(selectedTimeInMillis);
int intselectedDay = selectedDay.getDayOfMonth();
int intselectedYear = selectedDay.getDayOfYear();
if(intToday == intselectedDay & year == intselectedYear)
{
strDay = "today";
}
else if(intYesterday == intselectedDay)
{
strDay = "yesterday";
}
else
{
strDay = "before "+ days +" days from today";
}
}
else if(selectedTimeInMillis > currentTimeInMillis) //Future
{
long tomorrowTimeInMillis = currentTimeInMillis + 86400000;
DateTime tomorrow = new DateTime(tomorrowTimeInMillis);
int intTomorrow = tomorrow.getDayOfMonth();
DateTime today = new DateTime(selectedTimeInMillis);
int intToday = today.getDayOfMonth();
if(intToday == intTomorrow)
{
strDay = "tomorrow";
}
else
{
days = -days;
strDay = "after "+ days +" days from today";
}
}
Log.v("strDay: ",""+strDay);
}
}
You just need to change the value of day and you will get the desire output.
Currently I have given date 10 as input so output will be today.
I have set date/day = 10 , month = 8 , year = 2013 , hour = 15 , min = 28
For past dates:
input day 9 output yesterday
input day 3 output before 7 days from today
input year 2012 and day 10 output before 365 days from today
For future dates:
input day 11 output tomorrow
input day 27 output after 17 days from today
input day 23 and year 2016 output after 1109 days from today

Why not just check for yesterday and tomorrow to avoid the in 0 days/0 days ago bug and leave DateUtils.getRelativeTimeSpanString handle the remaining cases?
String relative = null;
if(now < due && (due-now)<864000){
relative = "tomorrow";
}else if(now > due && (now-due)<864000){
relative = "yesterday";
}else{
relative = DateUtils.getRelativeTimeSpanString(due, now, DateUtils.DAY_IN_MILLIS); // e.g. "in 4 days"
}
Log.d("result", relative);
Edit: You may also add today with a simple check as well.

Best way to format a date relative to now on Android
I suggest you to use JodaTime
It's lightweight handy library and i think actually the best tool for working with Date instances.
And you can start here.

build.gradle
compile 'joda-time:joda-time:2.9.9'
Utils.java
private static SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("MMM dd, yyyy");
private static SimpleDateFormat TIME_FORMAT = new SimpleDateFormat(" 'at' h:mm aa");
public static String getRelativeDateTimeString(Calendar startDateCalendar) {
if (startDateCalendar == null) return null;
DateTime startDate = new DateTime(startDateCalendar.getTimeInMillis());
DateTime today = new DateTime();
int days = Days.daysBetween(today.withTimeAtStartOfDay(), startDate.withTimeAtStartOfDay()).getDays();
String date;
switch (days) {
case -1: date = "Yesterday"; break;
case 0: date = "Today"; break;
case 1: date = "Tomorrow"; break;
default: date = DATE_FORMAT.format(startDateCalendar.getTime()); break;
}
String time = TIME_FORMAT.format(startDateCalendar.getTime());
return date + time;
}
Output
Yesterday at 9:52 AM
Today at 9:52 AM
Tomorrow at 9:52 AM
Sep 05, 2017 at 9:52 AM

The actual reason is the number 864000 is in miliseconds, which corresponds to 14 minutes. 14 minutes is so small compared to DAY_IN_MILLIS (a day). There for you get "in 0 days".
If you want it to produce "in 14 mins", just change DAY_IN_MILLIS to MIN_IN_MILLIS.

I came here for an alternative but I can't find perfect rather than my code.
So I shared here any improvements are welcome.
public String getCreatedAtRelative() {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
df.setTimeZone(TimeZone.getTimeZone("IST"));
CharSequence relative = null;
try {
relative = DateUtils.getRelativeTimeSpanString(df.parse(createdAt).getTime(), new Date().getTime(),
0L, DateUtils.FORMAT_ABBREV_ALL);
} catch (ParseException e) {
Log.e("Parse Exception adapter", "created at", e);
} catch (NullPointerException e) {
e.printStackTrace();
}
if (null == relative) {
return createdAt;
} else {
return relative.toString().replace(".", " ");
}
}

So your computation is based on milliseconds unit, then you format the result with SimpleDateFormat.
For this, you can easily use SimpleDateFormat formatter like this :
Date date = new Date(milliseconds);
SimpleDateFormat formatter = new SimpleDateFormat("EEEE dd MMMM yyyy");
String strDate = formatter.format(date);
So your computation should be based on milliseconds unit, then you format the result with SimpleDateFormat.
The pattern ("EEEE dd MMMM yyyy") allows you to get a date format like Monday, 04 February 2013.
You can change the pattern as you like : "EEEE dd/MM/yy", ...

for Android you can use most simple way with Joda-Time-Android library:
Date yourTime = new Date();
DateTime dateTime = new DateTime(yourTime); //or simple DateTime.now()
final String result = DateUtils.getRelativeTimeSpanString(getContext(), dateTime);

long now = System.currentTimeMillis();
DateUtils.getRelativeDateTimeString(mContext, now), DateUtils.SECOND_IN_MILLIS, DateUtils.DAY_IN_MILLIS, 0)
a link!